Abstract
Snails of the genus Stramonita are commonly found in the rocky intertidal habitat of the western Atlantic Ocean coast. They belong to a monophyletic taxon that occurs along the tropical and warm-temperate Atlantic and eastern Pacific rocky shores. This genus comprises different valid species and members of the S. haemastoma complex. In the present study, samples of Stramonita were collected from three different regions of southeastern Brazil. Partial sequences of two mitochondrial genes, COI and 16S rRNA, were used to compare nucleotides sequences between Stramonita specimens. Levels of nucleotide divergence greater than 2% across the three sampled regions were used for differentiation at the species level. One of the identified species was S. brasiliensis, which has recently been described by molecular analysis; the other species may represent S. haemastoma, not yet described in the southeastern Brazilian coast.
Highlights
In marine environments, genetically different organisms may arise due to ecological, geological, and oceanographic barriers under either allopatric, parapatric or even sympatric models of evolution (Rocha et al, 2005; Von der Heyden et al, 2011)
Not regarded as cryptic species, some species of the genus Stramonita contain features which make identification challenging; these features are characterized by a wide range of ecophenotypic variations, which can be corroborated by the morphology and coloration variability of the shell due to environmental factors (Butler, 1985; Houart and Gofas, 2010)
Stramonita, known as southern oyster drill, is a predatory marine gastropod mollusc found along rocky intertidal habitats of the Atlantic and eastern Pacific
Summary
Molecular evidence of two cryptic species of Stramonita (Mollusca, Muricidae) in the southeastern Atlantic coast of Brazil. Juliana Beltramin De Biasi, Acácio Ribeiro Gomes Tomás and Alexandre Wagner Silva Hilsdorf1 1Núcleo Integrado de Biotecnologia, Universidade de Mogi das Cruzes, Mogi das Cruzes, SP, Brazil. Juliana Beltramin De Biasi, Acácio Ribeiro Gomes Tomás and Alexandre Wagner Silva Hilsdorf1 1Núcleo Integrado de Biotecnologia, Universidade de Mogi das Cruzes, Mogi das Cruzes, SP, Brazil. 2Centro Avançado de Pesquisa Tecnológica do Agronegócio do Pescado Marinho, Instituto de Pesca, Santos, SP, Brazil
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